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This flying space cyote asked me to ask you all this.. "I only have pint jars, and want to do BRF or Rye flower but dont want to wait too long for it to colonize.. Could I put a heavy layer of perilite or vermiculite in the bottom of the jar to take up extra space?? If this isnt a good idea is there anything else that works good as 1/2 pint jars..(too cheap to buy new jars )Also If i dont do this im thinking of using bird seed or popcorn. Can I use normal popcorn?? Or does it have to be cracked?